package account import ( "bytes" "github.com/tendermint/tendermint/Godeps/_workspace/src/github.com/tendermint/ed25519" "github.com/tendermint/tendermint/Godeps/_workspace/src/github.com/tendermint/ed25519/extra25519" "github.com/tendermint/tendermint/Godeps/_workspace/src/golang.org/x/crypto/ripemd160" "github.com/tendermint/tendermint/wire" . "github.com/tendermint/tendermint/common" ) // PubKey is part of Account and Validator. type PubKey interface { Address() []byte VerifyBytes(msg []byte, sig Signature) bool } // Types of PubKey implementations const ( PubKeyTypeEd25519 = byte(0x01) ) // for wire.readReflect var _ = wire.RegisterInterface( struct{ PubKey }{}, wire.ConcreteType{PubKeyEd25519{}, PubKeyTypeEd25519}, ) //------------------------------------- // Implements PubKey type PubKeyEd25519 [32]byte // TODO: Slicing the array gives us length prefixing but loses the type byte. // Revisit if we add more pubkey types. // For now, we artificially append the type byte in front to give us backwards // compatibility for when the pubkey wasn't fixed length array func (pubKey PubKeyEd25519) Address() []byte { w, n, err := new(bytes.Buffer), new(int64), new(error) wire.WriteBinary(pubKey[:], w, n, err) if *err != nil { PanicCrisis(*err) } // append type byte encodedPubkey := append([]byte{1}, w.Bytes()...) hasher := ripemd160.New() hasher.Write(encodedPubkey) // does not error return hasher.Sum(nil) } // TODO: Consider returning a reason for failure, or logging a runtime type mismatch. func (pubKey PubKeyEd25519) VerifyBytes(msg []byte, sig_ Signature) bool { sig, ok := sig_.(SignatureEd25519) if !ok { return false } pubKeyBytes := [32]byte(pubKey) sigBytes := [64]byte(sig) return ed25519.Verify(&pubKeyBytes, msg, &sigBytes) } // For use with golang/crypto/nacl/box // If error, returns nil. func (pubKey PubKeyEd25519) ToCurve25519() *[32]byte { keyCurve25519, pubKeyBytes := new([32]byte), [32]byte(pubKey) ok := extra25519.PublicKeyToCurve25519(keyCurve25519, &pubKeyBytes) if !ok { return nil } return keyCurve25519 } func (pubKey PubKeyEd25519) String() string { return Fmt("PubKeyEd25519{%X}", pubKey[:]) } // Must return the full bytes in hex. // Used for map keying, etc. func (pubKey PubKeyEd25519) KeyString() string { return Fmt("%X", pubKey[:]) } func (pubKey PubKeyEd25519) Equals(other PubKey) bool { if otherEd, ok := other.(PubKeyEd25519); ok { return bytes.Equal(pubKey[:], otherEd[:]) } else { return false } }